The original source of comets is believed to be the outer planets.
If a scientist sees a comet with a tail through a telescope, they can surmise that it is close and approaching the sun.
The nucleus of a comet is primarily made of dark ice.
If a comet were large enough to generate more gravity, it would not orbit the sun.
The tails of comets are formed as gas and dust escape from the coma.
Most asteroids orbit the sun between Mars and Jupiter in a region called the asteroid belt.
Jupiter's formation was most responsible for the creation of asteroids in our solar system.
The best description of an asteroid is that they are remnants of planetary collisions.
What are asteroids?Asteroids are rocky objects that orbit the Sun and are primarily found in the asteroid belt, a region located between the orbits of Mars and Jupiter.
Most asteroids have irregular shapes and do not have an atmosphere or any significant geological activity.
They are often referred to as minor planets or planetoids because they share similarities with planets but are significantly smaller in size.
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This reflex involves extrinsic eye muscles, and is controlled by the somatic nervous system.
photopupillary
convergence
accommodation pupillary
The reflex that involves extrinsic eye muscles and is controlled by the somatic nervous system is convergence.
Convergence refers to the simultaneous inward movement of both eyes to maintain focus on a near object. This reflex is mediated by the contraction of the medial rectus muscles of the eyes, which are innervated by the oculomotor nerve (cranial nerve III). When an object moves closer to the eyes, the visual stimulus triggers the convergence reflex, causing the eyes to rotate inward and align their visual axes on the object. This allows for binocular vision and proper focusing on nearby objects. The convergence reflex is an example of a voluntary motor response mediated by the somatic nervous system, as it involves the control of skeletal muscles.
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Antidiuretic hormone prevents excessive water loss by promoting water reabsorption in the:
a) glomerulus
b) proximal convoluted tubule
c) distal convoluted tubule
d) collecting duct
e) bladder
Antidiuretic hormone promotes water reabsorption in the collecting duct, preventing excessive water loss.
The primary function of antidiuretic hormone (ADH), also known as vasopressin, is to regulate the body's water balance. When released by the pituitary gland, ADH acts on the collecting ducts in the kidneys. The collecting ducts are responsible for the final concentration of urine. ADH increases the permeability of the collecting ducts to water, allowing more water to be reabsorbed from the urine back into the bloodstream. This reabsorption of water helps to concentrate the urine and reduces the amount of water lost in the urine, preventing excessive water loss from the body. Therefore, the correct answer is option d) collecting duct.
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.__________ cells protect the central nervous system from foreign matter, such as bacteria and remnants of dead or injured cells?View Available Hint(s)NeutrophilsMonocytesMacrophagesMicroglia
Microglia cells protect the central nervous system from foreign matter, such as bacteria and remnants of dead or injured cells.
Microglia are specialized immune cells found within the central nervous system (CNS). They act as the primary defense system for the brain and spinal cord. These cells constantly survey their environment, identifying and eliminating any potentially harmful substances or cellular debris.
When microglia detect foreign matter like bacteria or remnants of dead or injured cells, they transform into an active state, engulfing and destroying the foreign material through a process called phagocytosis. This process helps maintain the health and functionality of the CNS by preventing the accumulation of harmful substances and ensuring a stable environment for neurons to function.
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the process of accurately amplifying a sample of dna is called __________________________.
The process of accurately amplifying a sample of DNA is called Polymerase Chain Reaction (PCR). PCR is a widely used molecular biology technique that facilitates the exponential amplification of a specific DNA sequence.
The process of accurately amplifying a sample of DNA is called polymerase chain reaction (PCR). PCR is a widely used technique in molecular biology that allows for the amplification of a specific segment of DNA. This technique involves the use of a DNA polymerase enzyme, which replicates the DNA strands by extending primers that are complementary to the target DNA sequence. The amplification process occurs through a series of cycles, each involving three steps: denaturation, annealing, and extension.
During denaturation, the DNA strands are separated by heating the sample to a high temperature. The primers are then annealed to their complementary sequences during the annealing step, followed by the extension step in which the DNA polymerase extends the primers to generate new strands of DNA. The end result of PCR is the exponential amplification of a specific DNA fragment that can be used for various downstream applications, such as DNA sequencing and genetic analysis.
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